usnic acid


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usnic acid

[′əs·nik ′as·əd]
(biochemistry)
C18H16O7 Yellow crystals, insoluble in water, slightly soluble in alcohol and ether, melts about 198°C; found in lichens; used as an antibiotic. Also known as usninic acid.
References in periodicals archive ?
Except for usnic acid, which is reported to have anticancer activity in vitro (for T-47D and Capan-2 cells) by inducing cytotoxicity (Einarsdottir et al.
The crude extract of lichen sample was filtered and stored at 4degC for 24 h to precipitate usnic acid (UA).
Although the cytotoxicity of usnic acid have been extensively reviewed (Muller, 2001; Cocchietto et al.
2004, The antimicrobial activity of extract of the lichen Cladonia foliaceaandits (-) Usnic acid, atranorin and fumarprotocetraic acid constituents.
It contained usnic acid, the same substance thought to have destroyed Jennifer Rosenthal's liver a year later.
Usnic acid does this by preventing photosynthesis through a key enzyme involved in pigment biosynthesis," Nanayakkara says.
The major concern in the application of usnic acid lies in its potential hepatotoxicity.
He indicated that some of the supplements that the agency will closely examine include bitter orange, aristolochic acid and usnic acid, all three of which, he asserted, can cause kidney damage and liver toxicity.
Additionally, certain products, such as androstenedione, ephedra and usnic acid have been targeted for closer examination and may be reclassified as controlled substances under the Federal Controlled Substances Act.
Contains usnic acid, porphyrilic acid (inconstant), rhodocladonic acid (in hymenia and conidiomata) and zeorin (forming needle crystals on thallus surface after prolonged preservation in herbarium).
In vitro interaction of usnic acid in combination with antimicrobial agents against methicillin- resistantStap/jy/ococcus aureus clinical isolates determined by FICI and [DELTA]E model methods.